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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940ceca0b02567aec4db2456c6aadb1731fcfebf15b2283246be56bc40881c36' 
  AND token = 'OFSnYo1P36ktN9KtAl9FXNHoVuXfQIV3Xjlz5Gb/8Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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