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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113aab84985477ee39131ccde2fce082f85f36004d4685f251f546c58bd9f1b0' 
  AND token = 'UJ2jX0GvRc3xQtt1Pr66Qc8hjqfdOALdcOrR8aw7HK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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