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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c9422d42ec676f943fa0d3d37f01f3750618028277d9b27ea9beaf28ccccec' 
  AND token = 'r/EzsElJuHymeensBseNDacYQwxz3VCSTCOOhAnjsR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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