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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84bb5c55a512132e688e07ec2e6c6fe1cde030125e217bad0e28ed7d09373e62' 
  AND token = '+Za4NPioHDIeUCzUSW2SDQi4JH+rYxO/geLDqF6LOWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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