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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7102e57f3fe302ded4576bb0f42c903663d7783df8c4ec68564d5e0bd15d20c6' 
  AND token = 'BZA8WQclLlp60AL28XJyP9zjjrhk4OE7uCsFRBWmdkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}