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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b0d728d4707c97d5b2a40691d0b02875613c8f6139a4cb726baa078bfc52eb9' 
  AND token = 'fvbOSCAcY0xzG70Ok+BIVilPrb6nKc2BzL+PitTs23c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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