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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4585c38e005ca6666604a56f384230fa56a773597074ee61d823173f3350a5' 
  AND token = 'J3ik8LDAolBLlmbfCV+Gr+Foq2EEyQsj/n+PgaKkt6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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