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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7fdf104275db681d52077ee514d6ab296599ec4929b52ef7bb5af342e4bf65b' 
  AND token = 'oaEHTvTdCun8J189uTBvXu1Q5jl+WoB1SynmhIT39V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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