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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca86a070904a0d166f1259c6757326b884fd8bde18b566fa158fe513ec43baac' 
  AND token = 'ZvFoZeTRpcha/22OiK1196dml2sl+G4ELG7m2icauFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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