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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0637465ff428fe7a38e7b8df168768ffda51cee2e2f4f2e7116a6e12dee46ee' 
  AND token = 'hxMLPZjB/zBIadDRIw3WowpVUkrYMXJU6E3cmTj2MSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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