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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce6be53312e5d771d6571a300f8aa047d790e501acc3a5c2b3d7657e9ac8e132' 
  AND token = '77oFkElrPIlvTC1LbIm+khT5cGQC1YZS64zkbJMm/1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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