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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d14d75f3c0c05f0c22effad4278b65c1f4b8105f0bdb2e653c27ce83627494a' 
  AND token = 'iILwGhlrttNykX/lZmv6tiGs3JH5FxW240MIlSLUOp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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