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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dece99d20b9d0c04b509cd2a29ea3ea1a0f2ea806f0dc1fb71411e357eb7099' 
  AND token = 'BC/cvgP1rj3+sAruAQjWAtb7m4HAwpTlA1a2WmthPWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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