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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b3621bed4f3f9351c3692d2192472484ad3ed2edb38bc381495040f9de73451' 
  AND token = 'ltPm6md4clBQj2wRlBIQjgqc9noT6ffOQez8x1Jl8h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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